Originally Posted by msheabel
My kenwood reciever (vr-309) can handle 100w (8ohm -16ohm) and the speakers now sound decent with the current configuration.
Given that you've changed the load impedance your crossover is seeing, if they sound 'decent', you've been lucky.
However, I would like to get them back to 8 ohms.
Why? You amp may output a hair more power, but it's not likely to make a huge difference.
Is there a way that I could hook up a resistor in parallel with the pioneer to make it a 4 ohm connection with the other woofer. if so would there be any performance loss or consequences
Yes, you could put an 8 Ohm load resistor in parallel with the new 8 Ohm speaker to create a 4 Ohm load (just like the original driver you took out). However, this will probably reduce the output of the speaker somewhat (by half - 3 db), and will definitely affect the balance between the various drivers. Though the crossover will now see the load it originally expected, half of the power that is being sent to this driver will now be dissipated into heat in the resistor, thus reducing your sound output.
Now, the upside is that your crossover will now be seeing the total load impedance it was designed for. Then again, you said you didn't like the sound to begin with, so this may not be an improvement.
Overall, it's an interesting idea, and it might be worth trying to see if it sounds better than what you have. I'd bet it won't (I'd expect reduced low-end output), but there are so many variables we don't know in the crossover and system impedance function.......? Give it a shot and see what happens. Unless you make a wiring error, you won't hurt anything by trying it.